Research on High Efficiency Hypoid Gear for Automotive Application

10.6567/IFToMM.14TH.WC.OS6.024

K. Saiki；S. Fukamachi

Transmission ； Hypoid gear ； Efficiency ； Gearbox test

Proceedings of the 14th IFToMM World Congress

14th-2（2015 / 10 / 27）

293 - 297

英文

Usually the transmission efficiency of hypoid gear is much lower than helical gear because of its large friction between the mesh of pinion and crown gears. Moreover, the spin loss is also remarkable for automotive application since the pinion gear is overhang-supported by preloaded bearings to receive big axial force. Therefore, the improvement of efficiency is an old subject and becomes more important for current fuel economy. This study directly measured the transmitting loss torques of each part of hypoid gear by using a gearbox test rig, and reconsidered the famous Coleman's efficiency formula of hypoid gear. As a result, the limit of Coleman's formula is clarified, and several attempts for design high efficiency hypoid gear are tried and practically applied to new developed CVT transmission.